Design And Implementation Of Sharing Scheme For Digital Resources Of Cultural Relics Based On Blockchain

The construction of digital museums has accelerated the dissemination and exchange of cultural relics.However,due to the different storage and management models used among museums,the traditional centralized sharing scheme is difficult to meet the needs of digital resource sharing between museums.In addition,the data center organization,the only data transfer department,has problems of excessive load,low sharing efficiency and so on.As a distributed database,blockchain has the characteristics of decentralization,non-tampering and traceability,which provides a new solution for the sharing of inter-museum digital resources.At present,the inter-museum cultural relics resource sharing schemes based on blockchain mainly have the following two deficiencies.In term of data storage,due to the volume of data,if they are all stored on the blockchain,it will make blockchain hard to expand.As for data sharing,firstly,because digital resources are reproducible and the cost of data resale is low,data owners lose the full ownership of the relics when the historical relics resale occurs,which will make it difficult to carry out sharing transactions.Secondly,users are reluctant to share precious historical relics without a clear blockchains’trust environment because the account address in the blockchain does not correspond to the real identity of user.Finally,for a single blockchain distributed network,a large number of transactions will seriously affect the scalability and operational efficiency of the blockchain.To solve the above problems,this thesis designs a model of cultural relics digital resource sharing with the principle of on-chain and off-chain collaboration.The proposed method ensures the storage stability of data through the off-chain storage system.Blockchain realizes efficient historical repository sharing under the premise of ensuring ownership and security.The main works of this thesis are as follows:(1)This thesis put forward a blockchain-based data sharing method.In this method,museums serve as nodes to form consortium blockchain and private IPFS clusters.At the same time,according to the requirements of cultural relics online spreading,the elliptic curve digital signature algorithm is used to ensure the ownership of cultural relics’digital resources,and an asymmetric encryption algorithm is applied to ensure the security of digital resources.In addition,share digital resources of cultural relics through the smart contract.(2)This project constructs a trust management model for evaluating the trust values of nodes in data resale scenarios.The trust management model calculates the trust value of the nodes in the sharing process of cultural relics’digital resources and integrates it into the smart contract.The data owner can dynamically decide whether to share cultural relics’digital resources according to the data requester’s trust value.On the other hand,nodes with high trust values(the ratio is p,and 0<p≤1)are elected as consensus nodes.The optimized consensus algorithms are called T-PBFT and T-Raft.The experimental results show that this scheme improves the fault tolerance of the PBFT algorithm to(pn-1)/3+(1-p)n and improves the throughput of the PBFT algorithm.(3)In this thesis,the author comes up with an optimization solution for current cultural relics’digital resources sharing by employing sidechains and the trust management model.The solution firstly expands the sidechain of the consortium blockchain and stipulates that the parent chain uses the T-PBFT algorithm with Byzantine fault tolerance,while the sidechain uses the T-Raft algorithm which is only suitable for high-trust environments.The consortium blockchain dynamically chooses to convey data in the parent chain or in the sidechain based on a threshold value preset by the owner of data.When the consortium blockchain switch from parent chain to sidechain to exchange information,the pressure on the consortium blockchain can be relieved.At the same time,the communication complexity is reduced from O((pn)~2)to O(pn),and the throughput rate of the sidechain remains at 260-270tps/s.(4)This work realizes a cultural relics’digital resource sharing system based on blockchain with three functions,namely,storage,retrieval and download of digital resources,and has carried out page display and function tests.